First questions , what rifle are you using , what is the bore size - land and groove ? Carcanos have deep rifling that tends to tear up cast bullet , many have gain twist which also tears up bullets , some have .268 + deep groove that do not work well with an undersize cast bullet . Also be very careful using the .267 jacketed bullets as they are made wrong and will cause bad pressure problems in some rifles , depending on the bore size , barrel length and gain twist .

First questions , what rifle are you using , what is the bore size - land and groove ? Carcanos have deep rifling that tends to tear up cast bullet , many have gain twist which also tears up bullets , some have .268 + deep groove that do not work well with an undersize cast bullet . Also be very careful using the .267 jacketed bullets as they are made wrong and will cause bad pressure problems in some rifles , depending on the bore size , barrel length and gain twist .

What do you mean "they are made wrong"? I just picked up a couple of boxes of the ones pictured above.

The guy at Hornady did not understand that Carcano's had different land and groove sizes , nor did he understand that all militaries used "bore riding " [ smaller than groove ] bullets . He kept tearing up jackets do to over sized bullets and the gain twist rifling . He kept making the jacket thicker and tougher , the opposite of what needed to be done . Then he had to specialize his load , and that still only works in some rifles . If your rifle has a tight land ,very deep rifling , or the overall smaller bore found on M-41 rifles , you can have very high pressure problems . Swelled cases , blown primers and so on . In short what happens is the thick oversized jacket has very high bore friction , the deep land try and engrave the jacket , more friction , then the bullet hits the different twist rate rifling and drags some more . All of this together can really raise pressures . We did some tests that shot the core out but left the jacket in the bore .

Thanks for mentioning that M-41's tend to have smaller bores. I think mine is that way as compared to my other Carcanos. Mine was made in 1943 for reference purposes. I just thought they wore out their rifling reamers and stopped caring by then.